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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82841effdef3601ebca6118621ae54c685236617a4cd176668c10c2e16e36bf6' 
  AND token = 'wdFvvDv+Ju8z9PEDU19wgSVJMvTG5t9OU3Xo4kBKklU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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