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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58965d161514a9d8ce31913b47fab5f2e09356e6a12135b890166c00e2adfd5' 
  AND token = 'BgZzJXUm3bzy0bJUi8z0kAomPMzaLqx9QdKE7TGt8TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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