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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf81a18e5dfa2367e7ee0948b037ea0bc0089abf9ef7634d15364677f017e88' 
  AND token = 'LWMnHD96rLwlFT+phiecSjYh0NFPHn8T/+X3Z867PYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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