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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad3f68dc746548564ddfb8948b908c2b24d0c465d16f017edfb79221a290f29' 
  AND token = 'QLtZ+EHFna+Z8iRreBmJHgZljm7p2LRV9nDL6xj3x4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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