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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439b1db8421d75480dd66e10622d6a85d87498bd2c6c3da340c7e614ff7add8c' 
  AND token = 'a1ACrohNybkzHbEa9N7tEEtST/jaQ5XeZmVcUSkxOdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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