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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847417ee73cca239a2c6040ab6829b740dea799e12300c69cc4fe2e7ff83449d' 
  AND token = 'r5DLhxQ6aWWLAgmj6YAL6PO3bEWAFaMHMyYgilVx78Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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