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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc30a637df2c232b8f62ffb2a36fde873d21f9616e36543b3de80cb67f340cf' 
  AND token = 'i68Utz8eiVC5f97rKGFB7Kt+Vh2yiX9wFcWJsw/wjk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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