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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da00c042f14c409ea9bb05a49cb482aa85ab9aee02e94063aff65e19b8b3806d' 
  AND token = 'tu/lllwkhUqGkhSjSOPr4hqqCKHmIGx7oF3b6dOApIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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