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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacbb37c46e652a4ef6b21f8f111a443c6cefe417ba58dd13817356fd13fe447' 
  AND token = 'J0H4tjI4SuMr5dUA6vnzVNF3+J9WSNvwayOqgB6U8BM=' 
  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"
    }
  }
}