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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4030722063a5e24ef8c3274694d7afa5b3bdd0de4f9ce11b60c0259df7a949' 
  AND token = 'UmV/ws890XzUXWAXr4mZiJk2glns1CIzeytrF1oe+5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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