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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea3d10986469b19f103e2d0bf7550d0fd5b1f5058191d9dbeb0e238f2a4e050' 
  AND token = 'xLlV0daroJQV4CJRfSADAlHdyr2bqk8lxnnD43QAe9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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