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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31885d26167ddd9577e5107e1d007fd0b41ed555ecc8763636b88e932835e5b' 
  AND token = 'B+C1a0Wur8WN/hqJ3tkP0N3fP9NbB6lOkM7ap2tz/xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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