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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44e1190f2c8d4abdbf69fe75261e37fa1df8765f15aa5126927960e68281d6d' 
  AND token = '8fJkLbm9SQlvhgK5QuWWvsAXkl6/C47Vg5DMC7Dsgkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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