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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b75589f56749671cae93920d53ad8876b0656935a09ea31ed2a610e321f9b2f' 
  AND token = 'wyqS6y6ybNhbZrHUmrS5T8/ywUu87bgUjcqLLtDrUd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}