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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81a87f8073ba6edadb6fdd73177ce86a8d62947009ee4763085d0df9afd067d' 
  AND token = 'WaXkU93gXWW4eSxaBNaFE98xUKYMfpdQUS+qqeq0BZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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