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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474161d82f7c7132c8b0b326157aa7c122bce4a295115386be27ce404bb7f902' 
  AND token = '3G6XZvm9LwVc4w+buz7+SD0vq/WY8o4SknSbxBSqerQ=' 
  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"
    }
  }
}