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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17080b8d9ef458cb7b1092b1a1294c3e4c2e79e7bbe8d1daabe23c490aa390d' 
  AND token = '92aVGotfJUSzdvMJJBhu+mLWrZQA+ILX7bcuM8IZ26s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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