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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29417286b9c27fbd7c8334453388f052eccf7e8e11899e11e7e5d913f50106b2' 
  AND token = 'ej6oA8VZMZQ4uHGFAC8Z53muZYLhojF4SiCqgu85FTw=' 
  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"
    }
  }
}