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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54b5bc1661b17adbed59eefc835416235c6b79aa2775f487c8d24df610be5f8' 
  AND token = '8JeCcFKfjDArOicZHKUh+HiaTt4ASQFrTnG3h5vXZso=' 
  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"
    }
  }
}