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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e689d85bac49e510a79fbe1d5274b62763501e2ac081f676c6421ea03966c629' 
  AND token = 'u3aRv0yxLxQ2UKgyyeWZ/eapot3bj3OIm3kSBlWyljY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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