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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7031eb82408e912f6ea6f67f892d35911894dd3a9efd397bf9c106e8f7162cd2' 
  AND token = 'eDz2Jm6vPG9A7TwONGdkaySWicvD6y+/kO2iJ51cVR0=' 
  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"
    }
  }
}