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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a423d98634abe2e88f0c9624908796e135a39655ffd54b01838e9faa37c0bff' 
  AND token = 'TWW9QgACPy/Llc2e71O8Jlt+KtOx17+iQ37res4w4Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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