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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d41a448f67b41502593bb5168eb06be025dc21fbf933cfa70a0cd0b830fc9d4' 
  AND token = 'UT2R6vTUaGzk/eIcif+r4p9n2pR3lyycjjKnZTciRjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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