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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69085425da06c8e31f91d435232ab128d04e0b9e02a37f1735aef3ca1d25274a' 
  AND token = 'kn43IwdqXNx5ZE5eUsn8Y7ttIKIL0TKsK8elRU5lEsk=' 
  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"
    }
  }
}