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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e089bca2b66a670c7d3d0a9da480de37a855918d8d39d4e05b7bcd073623ed52' 
  AND token = 'wBxSQI8AdRLup8EM9PwlsiXqTLjimDdXEHO+e/EqEPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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