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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e30380fd544346f99a539cefee17e595319b3caeff410cba28acc753f942c4' 
  AND token = 'p2JyTe1W1MpWL9lx00CSGrwd6c8SmHL9lcc+QTgoXj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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