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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4180098c3664528ab98165e1d3ef23f8ce12f06e6ac69b66de2192d999838697' 
  AND token = 'ux3BoeVy2wwH2QCUtXMtZ+zaFLiRCX2qSe/TcgaXN3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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