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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36854a6634bc8acdcf254cb78ef2156459459b52b91c85fbbfeaf9045110ffeb' 
  AND token = 'HTrMwTOkz3W1Tt3JgXj1RsqCsnL9K63bUBAdM4c1rWM=' 
  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"
    }
  }
}