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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da231d585f75fc785dedebcf2d081159dc6afb09454d742c3f578290bb0a16a' 
  AND token = 'E44wDNuv3unnofPj4ND9yqzPXsgwi1ehrMJU5IUKO+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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