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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06dd8785d349f162c60acada9188c5777d10cd5700fdc00d5a4c2756e970333' 
  AND token = 'Jo+vacWcW2aOmBuNmjCSZKE0Tk353qQoFUE7WGH6xuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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