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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c63c7b4074c5de7267a90824a35334c67ae24ed5531dfb0836245a99ad4f0d' 
  AND token = 'as6eHECXgE4w3N16Ylw0KKu1HNzI+NNc3kBavkp8Ma4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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