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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dfe636e1c40e3b6695c09d68ff988e93b5cb1ecf50ed31cdfa64bdac7df25a' 
  AND token = 'q4dJKwQZ6odm7lU7J9fzHUrlns5YEAOPDIBPVFJwi7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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