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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b704b872ce24699bb513641408073a4d1077b3bbf7ef5baa217f3e82e91f12' 
  AND token = 'MEFwxPfOhKJ3yNGo95+r8GHUeeQPxDjaq62u5x3X6LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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