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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d8bc3034023713a10a11b5943506fa86e24d09be7c776ecb2a6d93d0a92687' 
  AND token = 'L+qQH7l5mHH2bc62B8dQuKOeaQ8NM1Wjb5rGSKxmFKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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