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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f0e53bf985ac5d0e8bc1d8f8d8bddfc72c121b24bb580aeb0fc55c1b4fc598' 
  AND token = 'LcG8ZCzUsPuxVyHAS/VRe90keeP8Ybp9zh/2AD1yd64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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