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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f514754aec90526b94062a6f51a4c9a2adbbd14b68c33e82ffe5f7d313d01d' 
  AND token = 'PLbIXrhKsUsbTjruBwoRVVtq6eEQk34EvB1VEmJjssU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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