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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d8a7c6df9b25000d87d0514853f9852bcca1496497ea9e480dc879a9fbf018' 
  AND token = 'CWeZctqTDP5RDwNy4LKCaUpEjZg1uu6c/GFmq4M5O10=' 
  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"
    }
  }
}