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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341dc190f77979f67b7948f6b4624c4b6e035494aa662882f4963f31d4034ec2' 
  AND token = '/l4MbEGMHZ8o0l/GQStToPfDijNbzKyJi16G2TMEUbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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