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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2a9cccaa36825bb70b1ccf68b7e89c0f16eb0e917fc2b4cb9f5d0e8e282600' 
  AND token = 'b6uVxtnHNzOpEmIGG/oJyp1WvlOeO/W++Eswx35Jvm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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