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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06db2d9555dcb49524146b4cf9e3e528d175f65b8223305f96ce53f55666bce' 
  AND token = 'PQgVkceRxJAiAKPR50P4lb4VazrsOKOOYTfUTnxyFy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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