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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c897d2da86cbe676cba678c608871858c88a2282019eae04fa93361563d600' 
  AND token = 'L1F4zN0U/jGgRzeQCka1m5Tb4qfKPXL7d+Pz5gA7adc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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