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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77808610b36e63d2b99c179e5a39d18a21cf8ee8a43e27051c19fcd82073acc2' 
  AND token = 'i5djaf/gYjgl502N/bx25dbK1AVXi1EmqYO2tRVPO7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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