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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3ea6cb7ed80770766f691d2603dccdbaa2f420cdf2469b74948c01b37a451d' 
  AND token = 'KVv35wXOzdxk6ZlDSS1f/Cljwd207iwqIJiZI4ftmtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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