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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da10b5785cdd306ea3344f8bd893483f72f50a42d745fcbae539e425de8659e3' 
  AND token = 'mBpY39msLawBFjNd9FW2RG/UUS6m14GYp8lfHQcF6Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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