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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d1e658bdfb12260f345fba97741d60546f9468927af6bb644c8186b41401e5' 
  AND token = 'n7qZR81/es+I32nQyHshmpXe2S9YfD/tbOYzyFbzkRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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