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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab903d2da36c083c820287b6d3a982b2339780e238e1fd37b47d2644b6d80f28' 
  AND token = 'haqHmN/sbdu0BEGC7yFoN/CuEItXduOI98NoEecYUsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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