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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cbf992880e7be79af859213b217d2e9c0d1e93dabaff6b9832cedd688ddc80' 
  AND token = 'SLZ7AbTpidyYSpJXB45RVpqlxJlGC1R78+qoYR8mGkc=' 
  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"
    }
  }
}