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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef96d26bc6bdba76738a0401b2bce8a75c66891616b142abc55bffb41c99c4a2' 
  AND token = 'nztRz1ul2zb8uKeK0tbUhrZl6+p2ye46vrPsEuEZKTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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