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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c215af8df5fe3a0ff66ed3069f43d8fd18342107853acfea56a59cf3b2d7b7b7' 
  AND token = 'tVMpdQXeuOYs0/arXdLT0rrR8YABevlkQuHtxZ8SxcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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