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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e1226c146173c49a914ceb5fb48887bae823a66498f047b3f744696a12856d' 
  AND token = 'EkNzQhoqJcFKSYc4w42im0KEJzlKKT0m5rrkGM9IpNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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