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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47c63accadb767db56e84f7b495b01d78e6b3874b3ac069c5146e54576d1b1e' 
  AND token = 'pxFz3IB//JWynJmjBCSeUTxaaCbkI+/K9vkgZBB1Uok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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