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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a27524a3cbc72f7c0638a87419465a81ef0975c1d1f6e55ee5d51874daf4fa' 
  AND token = '6UmADoEcFVSM94Gg33cJl8d3sg2pH096k8to1Ser5Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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