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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e90f530d4c0c34a55513539655abc4d0945c7acd72337f99ec3ded9a0557c84' 
  AND token = 'rdsMr+J1QF0P6Nsd1XmtA7h5LJe+UB+dpU5VE1tRIuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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