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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bebcb7a2ee67bb44e38733aded3342dbce21ae071869cae4574dfb27a3920af' 
  AND token = 'nPjA/ChM6tLa6lo2U68r2IMkWggg72QoD7xx6AGEJ8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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