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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4329c0c2916da3859173571438f46c9ae467247fc40cd5af286de8dba06ba68' 
  AND token = 'uMSKZdHnH1zItzqSIh+CpZDgWXClu8PyQt21faNrE0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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