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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02265e868b97535311020054a1abb4e85b8c53202c469dc9e0fdaa340e58e3e8' 
  AND token = 'yn4Y3l4witGW/njFPwEpEeMwywypI1j+U2sTSb7KakY=' 
  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"
    }
  }
}