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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62661847c26802ba4f7bf64348e7e8f2f7ef964ab5bed2e5861959c270f3b8c7' 
  AND token = 'rlqQx4E5NXv3PjyNs/YESWkHLLF4eHMMVf7k+8p8zWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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