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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32231fdcf131798cb7d80cd1a3fa81f8c1f950ceb09449115757a5ed6d7655b3' 
  AND token = 'f3C6+Icg/Xui2SX+qrtv4Qxz97zefd5rMHl1xDSSoUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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