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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d04cb3b04d9bf559d1e78855af3bfca6ebb00d9b508e96a0d6ea71b92d4a8d' 
  AND token = 'jT05Js7G0fhn/iZzEP6oMMcqLVY3fsQWXys7pFYtIz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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